The 21st century organization known as UNICORN used a giant
computerized flying robot ("Giant Robo") as its secret weapon in the battle against
evil. A small boy named Johnny Sokko (code name U-7) controlled the
operations of this massive flying mechanical man whose head was
covered in an Egyptian style head dress.

Emperor Guillotine forced scientist Dr. Garulcher to build
Giant Robo on a remote island, but the Emperor was denied the
robot's power when Johnny Sokko (Kaneko Mitsunobu)
imprinted his voice patterns (through
a special watch) into the robot's circuitry.

For his betrayal, Dr. Galrucher was killed by the BF Dan, but Johnny
Sokko was now in control of the doctor's imposing and powerful
robotic creation who would only respond to his voice commands.

Stills from Episode No. 1 "Draculon, the
Great Sea Monster"

Draculon
attacks ocean liner at the command of
Emperor Guillotine

Unicorn
Agent #03 and Johnny wash a shore an
island

Unicorn
agent and Johnny are interrogated by the Gargoyle Gang

Unicorn
Agent and Johnny escape their captivity

Unicorn
agent and Johnny discover the giant robot

Scientist
reveals he was forced to build the
indestructible robot

The
scientist reveals the watch that controls
the giant robot

Johnny
speaks into the watch and imprints his
voice on the giant robot

The Mushi Film company of Japan which produced this program later
created SPACE GIANTS/SYN/1969 about heroic robots who fought to save
the planet Earth from gigantic evil prehistoric monsters created by
Rodak, an evil alien scientist. See also "Goldar"